It depends on the particular atom in question. Any of those subshells can make up the outer shells of atoms. Examples: In Mg, the outer shell is the 2s subshell. In P, the outer shell is the 3p subshell. In Fe, the outer shell is the 3d subshell, etc.
valence electrons
Because the shell can only hold eight electrons. check
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Atoms with outer electron shells that contain 8 electrons tend to be stable and chemically in reactive, or inert.
Reaction between atoms involve only valenceelectrons (electrons in the outermost shells of atoms).
They are shared by the valence shells of the atoms involved in the bond.
More the number of shells in an atom, more away will be the electrons from the nucleus. Hence, weaker will be the attraction between nucleus and outermost electrons. So atom with more shells will let go their electrons easier than atoms with fewer shells.
they add or loose electrons from the outer most shells
atoms try to get 10 electrons on shells around the atom. how many shells the atom has is based on the atomic number and atomic mass the atomic number determines how many shells their are.
Valence electrons are involved in bonding to other atoms.
valence electrons
They share electrons when they try and corm covalent or ionic bonds. This is because the atoms want to gain a full outer shell. So when they share electrons they can have full shells.
Electrons involved in bonding between atoms are valence electrons.
They are the electrons in the outermost shell, and are the ones involved in most chemical reactions.
Atoms bond because they "share" their electrons. Every atom wants to have 2 atoms in their first shell, and then 8 in all the other shells. Lets say we have an atom with 3 electrons, and one with 9 electrons, they will esaly bond
Valence electrons form the bonds between atoms in a molecule.
A covalent bond is formed when sharing electrons.